Rough Road Sensor B Signal Circuit
Your vehicle has a wiring or sensor problem with the rough road detection system that helps with suspension control. Think of it like a smoke detector with a bad battery—the system can't properly sense what it's supposed to monitor.
The ECU monitors the Rough Road Sensor B signal voltage and frequency to detect road surface conditions for adaptive suspension or damping control. The sensor should produce a variable signal between 0-5V that changes with road texture. A fault occurs when the signal stays constant, is absent, or falls outside expected patterns.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Signal Voltage | 0.5V - 4.5V (dynamic variation) | 0V, 5V (stuck), or no signal change |
| Signal Frequency | Variable per road conditions | No variation or missing pulses |
Code P0319 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0319 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.